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2. M. A. Greenfield and H. Margolin: New York University, Bronx, N.Y., unpublished research, June 1970.
3. L. S. Croan and F. S. Rizzitano:Trans. ASM, 1959, vol. 51, p. 999.
4. W. W. Gerberich:Trans. TMS-AIME, 1967, vol. 239, p. 753.
5. ASTM: Recommended Practice for Plane Strain Fracture Toughness of High Strength Metallic Materials Using a Fatigue-Cracked Bend Specimen, Proposed Method, part 31, May 1969.